Abstract: In light of the serious thermal damage of diamond and the serious deformation of grinding wheel matrix when Ni60A was used to prepare brazed diamond wheel with Ni60A, the influence of graphite on the forming mechanism and mechanical properties of Ni60A brazed diamond was studied. The results show that Cr₃C₂ (flake-like), Cr₇C₃ (cylindrical hollow), eutectic graphite (threadlike) and metallic compound generate on the surface of diamond after the samples is chemical attacked with aqua regia, when diamond is brazed with Ni60A added with graphite. The content of graphite and amorphous carbon on the surface of diamond and the maximum residual stress (tensile stress and compressive stress) of diamond decreases, meanwhile the hardness of brazing layer reduces with the increase of graphite content in Ni60A. The microstructure of brazing layer is γ−Ni solid solution, uniformly distributed compound and disordered graphite.